Lifting device for pipe slips



April 21, 1931. J O'BRIEN 1,802,156

LIFTING DEVICE FDR PIPE SLIPS Filed Jan. 19, 1929 2 Sheets-Sheet l April 21, 1931.

F. J. OBRI EN LIFTING DEVICE FOR PIPE SLIPS Filed .Jan. 19, 1929 2 Sheets-Sheet 2 Patented Apr; 21, 1931 UNITED STATES OFFICE FREDERICK J. OBRIEN, OF TITUSVILLE, PENNSYLVANIA, ASSIGNOR TO STRUTHERS WELLS-TITUSVILLE CORPORATION, OF TION OF DELAWARE rrrusvILLn, PENNSYLVANIA, A coRronA- LIFTING DEVICE FOR FIPE'SIJIPS I Application filed January 19,: 1925.,s aro mea;

This invention relates to a lifting device designed more particularlyfor use with the jaws or slips employed in connection with the rotary tables of oil drilling equipment now in use and which does not require the use of separate fastenings to anchor it to such table.

In the accompanying drawings Figure 1 is a sectional side elevation of the rotary table of a drilling apparatus showing my lifting device applied thereto. Figure 2 is a fragmentarytop plan view thereof. Figure 3 is a section side elevation, similar to Figure 1, showing the pipe slips withdrawn from their gripping position. Figure f is a perspective view of the supporting frame of the lifting device. 1

Similar characters of reference indicate corresponding parts throughout the several views.

By way of example, my invention has been shown in connection with an oil drilling apparatus of the rotary type, 10 indicating the rotary table and 11 the table-bushing having the customary tapered opening 12 through which the pipe or casing 13 extends. This casing is held suspended from the table; bushing by suitable pipe slips 14 seated in the tapered opening thereof, the slip unit shown in the drawings consisting of two half sections, each section being composed of a plurality of jointed sectors to enable the slips to accommodate themselves in gripping the surface of the casing.

In order to efiect the ready insertion and removal of the slips into and out of the opening 12 in the table-bushing and with little effort, I employ a lifting device which is com- 50 posed essentially of a frame or support detachablymountedon the top side of the rotary table '10 and pivoted carriers for the slip-sections movable relativelyv to the sup port for lowering'an d raising such sections integ and outo'f their operative position, there be ng .ac'ompalnionsupport and carrier for eachhalffsec'tion of the slip unit. u 1 i The frame or support of the lifting device, in'dicated generally by the numeral 15,0011 si ts 0f {substantially- ,u shaped members shaped lfrom flat, bar stock or ,otherwise and'applied "to the top ,ofthe table on diametrically: opposite ,7 sides thereof with their" open ends facing each other, as seen infQFigureZj The freev ends of .the parl- 11;

.allel arms '16fof, each frame terminate in depending hook-shaped; lugs 17 adapted to {engage corresponding openings 18 in thetop wall of the table-bushingll, as shown in Figfures l and 2. .-Theho oked-ends of these lugs 7 interlock with the. undersidesofthe compan- Y ionopenings to prevent vertical displacement .offtheframe. In applying the latter to the bushing, it is held in asubstantially upright positio'r'iwith, the hooked ends thereof engaged with theopenings- 18,, after which the frame, ,fswung to its horizontal position Ioverlyingf'thetable. r 5 j w Jo urnaled,;in each frame adjacent the closed end thereof is a transversely-disposed rock shaft 19 providedat, one. end, with a crank-or handle 20 intending toward the 7 axis of the rotary table 10 and normally overlying thesame. As shown in Figure '2 the handle of one frame is disposed at one side of the slips 14 and thehandle of the other frame is disposed on the opposite side thereof, sothat both handles may be operated conveniently without interference. Fixed on each rock shaft by pins 21 or otherwise, to turn therewithare suspension arms orlevers 22- which extend inwardly from the shaft and have their 'inner' ends. curved downwardly into the upper end of the opening 12 in the table-bushing 11, as shown in Figure 1. These suspensionarms are pivoted at 23 to the upperv ends of links 24: whose lower ends are pivoted at 25 to lugs or projections 26 rising from the companion slip-section. This pivoted-link or flexible suspension arrangement enables the slip-sections to independently adapt themselves to the surface of the pipe casing and at the same time facilitates their insertion and removal into and out of the opening of the table-hushing in a more or less pendant position as the respective rock shafts 19 are turned in one direction or the other. ing of the slip-sections during their raising and lowering movements and in no way interferes with the selfcentering of the sec= tions in the table-bushing opening.

While this device has been shown and described in connection with the lifting of pipe slips, it is to be understood that it can be used equally as well with casing spiders, elevators and the like.

I claim as my invention 1. In a lifting device for pipe slips, the combination with the table and the tablebushing of a rotary drilling apparatus, said bushing having openings in its top wall, of supports arranged ondianietrically opposite si es of the table and having hook-shaped lugs thereon for detachably interlocking with the openings in said table-bushing, verticaily-s winging carriers fulcrumed on said supports in opposing relation to each other, and

plpe-gi' ppmg elements having attaching lugs rising therefrom and flexibly connected to the free ends of said carriers.

2. In a liftindevice for pipe slips, the

combination witi the table and the tablebushing of a rotary drilling apparatus, said bushing having openings in its top wail, of su ports arran ed on diametrically opposite sides of theta 1e and having hook-shaped lugs thereonfor detachably interlocking with the openings in said tablebushing, rock shafts journaled on said supports and each provided at one end with a handle for actuating them, vertically-swinging suspension arms fixed on said shafts, pipe-gripping members having lugs rising from their top sides, and links pivotally connecting said lugs with said suspension arms.

FREDERICK J. OBRIEN.

This construction also prevents bindv 

